apparently you can tell but its not 100% by the length of the tail after its bum and anal spurs but idealy you would want to compare it to a deffinate female.
1.0.0 Royal Python (Monty) 1.0.0 Western hognose(Fredo) 0.1.0 false water cobra(Suzy)
You can get females with large spurs and males with small spurs though. The same goes for tails, so while you can make an educated guess, it really is a guess.